Hello, We recently upgraded our ELK stack from v 7.4.0 to 7.7.1 and now we noticed that the OS CPU is 100% on our hot data nodes which do the indexing. The OS CPU is almost always at 100%, the process CPU is close to 45-50%. We checked the hot threads and saw 98% of the times it is Lucene Merging …

High OS Cpu usage on 7.7.1

Ignacio_Vera (Ignacio Vera) July 14, 2020, 1:14pm 5

I am wondering if the problem you are experiencing is due to wrong JVM settings after upgrading. See: Elasticsearch 7.8 worse heap management

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